You drew lottery N times. In the i-th draw, you got an item of the kind represented by a string S_i.

How many kinds of items did you get?

Constraints

• $1 \leq N \leq 2\times 10^5$
• S_i consists of lowercase English letters and has a length between 1 and 10 (inclusive).

Input

Input is given from Standard Input in the following format:

N
S_1
:
S_N

Output

Print the number of kinds of items you got.

Examples

Input

3
apple
orange
apple

Output

2

Input

5
grape
grape
grape
grape
grape

Output

1

Input

4
aaaa
a
aaa
aa

Output

4

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